Took my Rush out earlier for about its 4th/5th run and it starting making a horrible noise and hardly went anywhere at full throttle.

So i've stripped it down and found one of the cogs in the diff that connects to the diff shaft has two teeth missing!!

Can these cogs be purchased seperately in the UK?

Does anyone know of any upgrade diffs that I could fit to stop this happening again?

Has anyone got any idea how this could have happened as apart from having 4 shocks on the back everything is standard!

Cheers